Landmark rhododendron (Rhododendron ‘Landmark’) produces large trusses of dark pink flowers with red spots in the throats. Another selection from the Mezitt family of Weston Nurseries, this small-leaved, large shrub (up to 10 feet) retains most of its leaves in winter, which turn a bronze-mahogany color. All rhododendrons require acidic soil, and because their roots are very fine and located near the surface of the soil, they are particularly susceptible to droughts or floods. With few exceptions (such as sandy soil near Lake Michigan), gardeners should amend their soil with peat moss, apply granulated sulfur once a year, fertilize with azalea and camellia plant food, and maintain a mulch over the roots to keep temperatures cool during the summer and conserve moisture.